package com.yh.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.yh.common.to.es.SkuEsModel;
import com.yh.common.utils.R;
import com.yh.gulimall.search.config.ElasticSearchConfig;
import com.yh.gulimall.search.constant.EsConstant;
import com.yh.gulimall.search.feign.ProductFeignService;
import com.yh.gulimall.search.service.MallSearchService;
import com.yh.gulimall.search.vo.AttrResponseVo;
import com.yh.gulimall.search.vo.SearchParam;
import com.yh.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    private RestHighLevelClient client;
    @Autowired
    private ProductFeignService productFeignService;
    //去ES检索
    @Override
    public SearchResult search(SearchParam searchParam) {
        //TODO 动态构建出需要查询的DSL语句
        SearchResult result=null;

        //1、准备检索请求
        SearchRequest searchRequest = buildSearchRequst(searchParam);


        try {
            //2、执行检索请求
            SearchResponse response = client.search(searchRequest, ElasticSearchConfig.COMMON_OPTIONS);

            //3、分析响应数据封装成我们需要的格式
            result=buildSearchResult(response,searchParam);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return result;
    }

    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam searchParam) {

        SearchResult result = new SearchResult();
        //1、封装所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels=new ArrayList<>();
        if(hits.getHits()!=null&&hits.getHits().length>0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                //特殊的高亮显示
                if(!StringUtils.isEmpty(searchParam.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String highlightTitle = skuTitle.fragments()[0].string();
                    esModel.setSkuTitle(highlightTitle);
                }
                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);

        //TODO 当前商品涉及到的信息，我们都是从聚合中抽取的。
        //2、当前商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos=new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        //id的聚合
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");

        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //属性id
            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);
            //属性名
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attrName);
            //属性值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);

        //3、当前商品涉及到的所有品牌信息
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        List<? extends Terms.Bucket> brandBuckets = brand_agg.getBuckets();
        List<SearchResult.BrandVo> brandVos=new ArrayList<>();

        for (Terms.Bucket brandBucket : brandBuckets) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            long brandId = brandBucket.getKeyAsNumber().longValue();
            //品牌的id
            brandVo.setBrandId(brandId);
            //从品牌的子聚合中拿到品牌名的，图片
            String brandName = ((ParsedStringTerms) brandBucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);
            String brandImg = ((ParsedStringTerms) brandBucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

        //4、当前商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        List<SearchResult.CatalogVo> catalogVos=new ArrayList<>();
        for (Terms.Bucket bucket : buckets) {

            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //分类的id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //要拿到分类名-》子聚合中取出
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);

            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        //5、分页的信息-》（总记录数、总页码、页码、(所有页号)）
        long total=hits.getTotalHits().value;
        result.setTotal(total);
        int totalPages=(int) total%EsConstant.PRODUCT_PAGESIZE==0?(int) (total/EsConstant.PRODUCT_PAGESIZE):(int) (total/EsConstant.PRODUCT_PAGESIZE+1);
        result.setTotalPages(totalPages);
        result.setPageNum(searchParam.getPageNum());

        List<Integer> pageNavs=new ArrayList<>();
        for(int i=1;i<=totalPages;i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //6、构建面包屑导航-》（不做）
//        if (searchParam.getAttrs() != null && searchParam.getAttrs().size() > 0) {
//            List<SearchResult.NavVo> collect = searchParam.getAttrs().stream().map(attr -> {
//                //1、分析每一个attrs传过来的参数值
//                SearchResult.NavVo navVo = new SearchResult.NavVo();
//                String[] s = attr.split("_");
//                navVo.setNavValue(s[1]);
//                R r = productFeignService.getAttrInfo(Long.parseLong(s[0]));
//                if (r.getCode() == 0) {
//                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
//                    });
//                    navVo.setNavName(data.getAttrName());
//                } else {
//                    navVo.setNavName(s[0]);
//                }
//
//                //2、取消了这个面包屑以后，我们要跳转到哪个地方，将请求的地址url里面的当前置空
//                //拿到所有的查询条件，去掉当前
//                String encode = null;
//                try {
//                    encode = URLEncoder.encode(attr,"UTF-8");
//                    encode.replace("+","%20");  //浏览器对空格的编码和Java不一样，差异化处理
//                } catch (UnsupportedEncodingException e) {
//                    e.printStackTrace();
//                }
//                String replace = searchParam.get_queryString().replace("&attrs=" + attr, "");
//                navVo.setLink("http://search.gmall.com/list.html?" + replace);
//
//                return navVo;
//            }).collect(Collectors.toList());
//
//            result.setNavs(collect);
//        }



        return result;
    }

    /**
     * 准备检索请求
     * 模糊匹配、过滤（按照属性，分类，品牌，价格区间（不好用！），库存）
     * 、排序、分页、高亮显示商品名、聚合分析
     * @return
     */
    private SearchRequest buildSearchRequst(SearchParam searchParam) {
        SearchSourceBuilder sourceBuilder=new SearchSourceBuilder();
        /**
         * 查询：模糊匹配、过滤（按照属性，分类，品牌，价格区间，库存）
         */
        //1、构建了BoolQuery
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1、构建must
        if(!StringUtils.isEmpty(searchParam.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", searchParam.getKeyword()));
        }
        //1.2、构建filter->三级分类id
        if(searchParam.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId", searchParam.getCatalog3Id()));
        }
        //1.2、构建filter->品牌id
        if(searchParam.getBrandId()!=null&&searchParam.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId", searchParam.getBrandId()));
        }
        //1.2、构建filter->指定属性
        if(searchParam.getAttrs()!=null&&searchParam.getAttrs().size()>0){

            for (String attrStr : searchParam.getAttrs()) {
                BoolQueryBuilder nestedboolQuery = QueryBuilders.boolQuery();
                //attr=1_5寸：8寸
                String[] s = attrStr.split("_");
                //属性id
                String attrId=s[0];
                //属性值
                String[] attrValues = s[1].split(":");
                nestedboolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                //每一个都要生成嵌入式的查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }


        //1.2、构建filter->库存
        if(searchParam.getHashStock()!=null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock", searchParam.getHashStock()==1));
        }
        //1.2、构建filter->价格区间 (三种情况  100-500  _100  500_)
        if(!StringUtils.isEmpty(searchParam.getSkuPrice())){
            //skuPrice形式为：1_500或_500或500_
            RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("skuPrice");
            String[] price = searchParam.getSkuPrice().split("_");
            if(price.length==2){
                rangeQueryBuilder.gte(price[0]).lte(price[1]);
            }else if(price.length == 1){
                if(searchParam.getSkuPrice().startsWith("_")){
                    rangeQueryBuilder.lte(price[1]);
                }
                if(searchParam.getSkuPrice().endsWith("_")){
                    rangeQueryBuilder.gte(price[0]);
                }
            }
            boolQuery.filter(rangeQueryBuilder);
        }

        //把以前所有所有查询条件进行封装
        sourceBuilder.query(boolQuery);
        /**
         * 排序、分页、高亮显示商品名
         */
        //2.1、排序
        if(!StringUtils.isEmpty(searchParam.getSort())){
            //sort=hotScore_asc/desc
            String sort = searchParam.getSort();

            String[] s = sort.split("_");
            //排序字段s[0] 规则s[1]
            SortOrder order=s[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }
        //2.2、分页-》(pageNum-1)*pageSize
        sourceBuilder.from((searchParam.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);
        //2.3、高亮
        if(!StringUtils.isEmpty(searchParam.getKeyword())){
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");
            sourceBuilder.highlighter(highlightBuilder);
        }
        /**
         * 聚合分析
         */
        //1、TODO 品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");

        brand_agg.field("brandId").size(50);
        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);


        //2、TODO 分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //3、TODO 属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //属性的id子聚合
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //id的子聚合->属性名和属性值
        TermsAggregationBuilder attr_name_agg = AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1);
        TermsAggregationBuilder attr_value_agg = AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50);
        attr_id_agg.subAggregation(attr_name_agg);
        attr_id_agg.subAggregation(attr_value_agg);
        attr_agg.subAggregation(attr_id_agg);

        sourceBuilder.aggregation(attr_agg);

        String s = sourceBuilder.toString();
        System.out.println("构建的DSL"+s);
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }
}
